DIVI/DIVO

Drum-Type Indirect-Fired Warm Air Systems DIVI / DIVO

This page covers Keywarm’s currently available drum-type indirect-fired warm air systems, including DIVI for indoor vertical installation and DIVO for outdoor vertical installation. These systems are suitable for factories, warehouses and selected special hot-air applications where installation position and system routing matter significantly.

What Are These Systems?

DIVI and DIVO are drum-type indirect-fired warm air systems currently available in Keywarm’s product portfolio. DIVI is designed for indoor vertical installation, while DIVO is designed for outdoor vertical installation. These systems are suitable for factories, warehouses and selected special hot-air scenarios where installation location and warm-air routing are important project conditions.

Who Are These Systems More Suitable For?

They are more suitable for projects that prioritize indirect-fired warm air, structured installation judgement and flexibility in choosing indoor or outdoor main-unit positions. They are especially relevant when installation location itself becomes an important part of project selection.

When Should You Consider These Systems First?

These systems should be considered first when a project wants indirect-fired warm air but needs a clearer choice between indoor and outdoor vertical installation. They are also relevant in selected special hot-air applications such as freeze protection and mine air heating.

Core Advantages

Better for Main-Space Warm-Air Coverage

These systems follow an indirect-fired warm-air path suitable for industrial buildings that prioritize broader indoor warm-air coverage.

More Complete Installation-Path Choice

Projects can evaluate indoor vertical or outdoor vertical installation according to building conditions.

Better for Projects Sensitive to Installation Position

When installation position itself significantly affects project feasibility, DIVI and DIVO are easier to compare.

Better for Warm-Air Distribution Judgement in Specific Building Conditions

These systems fit projects where space layout, installation position and warm-air delivery logic must be evaluated together.

Better for Special Hot-Air Scenarios

They can also be considered in selected applications such as mine air heating, freeze protection and other special hot-air conditions.

Better for Judging by Project Safety and Installation Conditions

Because DIVI and DIVO differ in indoor/outdoor installation logic, they help projects evaluate safety expectations, equipment placement and building conditions more clearly.

A Quick Comparison of the Installation Paths

Under the same drum-type indirect-fired warm air heating route, the core difference between DIVI and DIVO lies in the installation location and structural orientation.

DIVI (Indoor Vertical Type)

Suitable for projects where the main unit is expected to remain indoors and indoor installation conditions are more favorable.

DIVO (Outdoor Vertical Type)

Suitable for projects where the main unit is expected to remain outdoors and stronger indoor/outdoor separation is preferred.

Typical Applications

Factory & Production Workshop Applications

Suitable for production workshops, processing workshops, and various industrial plants, with a focus on overall space heating, establishment of the building’s thermal environment, and compatibility with equipment layout. For projects that require more precise matching between installation position, equipment orientation, and building conditions, this type of system offers strong application value.

Warehouse & Logistics Building Applications

Suitable for warehouses, logistics buildings, and industrial projects that aim to improve the thermal environment of the main space through warm air heating. The focus is on overall warm air coverage, structural compatibility, and air supply direction selection. For projects that value both overall heating performance and rational installation methods, this type of system is worth prioritizing.

Mine Warm Air Supply Applications

Suitable for mines and related underground engineering applications requiring warm air supply, with a focus on continuous hot air delivery, operational stability, and compatibility with installation conditions. For projects that require continuous warm air supply to designated areas and have clear equipment layout requirements, this type of system typically offers strong comparative value.

Anti-Freeze Applications

Suitable for industrial applications that require maintaining baseline temperatures to prevent equipment, pipelines, or spaces from freezing. For projects that prioritize continuous warm air supply, freeze protection, and operational stability, this type of system is more suitable as an early-stage comparison option.

Drying & Dehumidification Applications

Suitable for drying and dehumidification applications with clear hot air requirements, focusing on continuous heating, air distribution, and compatibility with equipment layout. For projects that intend to use indirect-fired warm air systems to provide stable hot air in process applications, this type of system is generally worth prioritizing.

Projects with Specific Indoor / Outdoor Installation Requirements

Suitable for industrial applications where indoor or outdoor installation positions are clearly required due to building structure, construction conditions, maintenance organization, or equipment placement constraints. For such projects, the four installation configurations are generally more suitable for early-stage comparison.

Projects Sensitive to Vertical / Horizontal Structure Orientation

Suitable for industrial projects that have clear requirements for vertical or horizontal equipment orientation due to ceiling height, installation conditions, air supply direction, or equipment space limitations. For such projects, structural orientation is often just as important as the heating or air supply performance itself.

The application descriptions on this webpage are intended for preliminary evaluation only. The specific quantity of equipment, installation positions, air supply direction, and operating parameters should be further assessed according to actual project conditions.

How to Understand Indoor / Outdoor Vertical Layout Logic？

The main difference between DIVI and DIVO is not the warm-air principle itself, but the installation path. DIVI is based on indoor vertical installation, while DIVO is based on outdoor vertical installation. Therefore, selection should not focus only on heating capacity, but also on building conditions, equipment position, routing logic and project expectations regarding indoor/outdoor separation.

Quick Comparison

DIVI Models, Technical Data and Installation Documents

DIVI is more suitable for industrial projects that prefer indoor installation with a vertical structure for air supply organization. For projects with clear indoor installation conditions, spaces better suited to vertical equipment orientation, and requirements for improving the thermal environment or providing stable warm air through vertical heating equipment, DIVI typically offers high preliminary evaluation value.

Product Specification Sheet

Overall Dimensions

DIVO Models, Technical Data and Installation Documents

DIVO is more suitable for industrial projects that prefer the main equipment unit to be installed outdoors while adopting a vertical structure for air supply organization. For applications that value both the outdoor main-unit configuration and a vertically oriented equipment layout, DIVO is typically more worthy of priority evaluation.

Product Specification Sheet

Overall Dimensions

How to Understand Model Selection and Configuration

Model / Capacity Range

Different heat input capacities and configuration versions can be provided according to project requirements.
More specific model selections, technical parameters, and recommendations can be confirmed through project discussions.

Installation & Project Options

Installation positions, control methods, and related technical documentation can be further discussed according to building dimensions, fuel conditions, layout methods, and target operating conditions.
Final solutions should be based on project conditions and technical evaluation.

How These Systems Differ from WAB / WCB / HTC

Difference from WAB

WAB is an indoor indirect-fired warm air heater with a different equipment form and indoor warm-air path. DIVI / DIVO follow a drum-type warm-air system logic.

Difference from WCB

WCB is an outdoor indirect-fired warm air path with axial-flow or centrifugal fan logic, while DIVI / DIVO are drum-type warm-air systems with different equipment structure and installation judgement.

Difference from HTC

HTC is a radiant heating path, while DIVI / DIVO are indirect-fired warm-air systems.

Different system routes are not simply a matter of “which is better,” but are suitable for different building objectives, installation conditions, air supply logic, warm air applications, and spatial structure requirements.

Frequently Asked Questions

Q: What is the main difference between DIVI and DIVO?

A：The main difference lies in the installation location. DIVI is an indoor vertical model, while DIVO is an outdoor vertical model. The selection should be based on building conditions, installation location, and maintenance organization requirements.

Q: When should vertical configurations be prioritized?

A： When building space, installation conditions, and air supply direction are more suitable for vertical arrangements, vertical configurations such as DIVI or DIVO should generally be prioritized.

Q: When should horizontal configurations be prioritized?

A：When installation height, equipment footprint, structural relationships, or air supply direction are more suitable for horizontal arrangements, horizontal configurations such as DIHI or DIHO should generally be prioritized.

Q: Why are these systems suitable for mine warm air supply and anti-freeze applications?

A：Because these systems are suitable not only for warm air coverage in main building spaces, but also for applications requiring continuous warm air supply, baseline temperature maintenance, and operational stability. Therefore, they often provide strong comparative value in mine heating and anti-freeze applications.

Q: Are these systems also suitable for drying applications?

A：Yes. These systems can also be valuable in certain drying and dehumidification applications with clear hot air requirements. However, suitability should still be further evaluated based on process requirements, air distribution design, and operating conditions.

Q: Why are all parameters and drawings not directly displayed on the webpage?

A：Because different projects vary significantly in building dimensions, height, installation locations, air supply direction, hot air applications, and operating conditions. The webpage content is more suitable for preliminary evaluation, while detailed specifications, installation information, and air distribution documents are recommended to be obtained through project communication.

Q: What materials can Keywarm provide?

A： According to project requirements, Keywarm can provide one-page PDFs, product manuals, technical specifications, and further installation and selection support.

Q: If I am still unsure which configuration to choose, what information should I provide first?

A：It is recommended to provide basic information such as building type, dimensions, height, space usage, intended installation location, air supply direction requirements, hot air application, and operating mode. Based on this information, we can assist with a preliminary evaluation closer to the actual project scenario.

Documentation and Technical Support

If you would like to further compare the DIVI and DIVO configurations or move forward with project discussions, you may request related materials and technical support.

Download Product Comparison Materials